3X+4Y=166X-6Y=334(X-Y-1)=3(1-Y)-2X/2+Y/3=2
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3X+4Y=166X-6Y=334(X-Y-1)=3(1-Y)-2X/2+Y/3=2
3X+4Y=16
6X-6Y=33
4(X-Y-1)=3(1-Y)-2
X/2+Y/3=2
3X+4Y=166X-6Y=334(X-Y-1)=3(1-Y)-2X/2+Y/3=2
x=38/7
y=-1/14
x=2
y=3
1. x= 60/7 ,y= 43/2
2. x=2,y=3
第一题:X=38/7;Y=-1/14
第二题:X=2;Y=3.
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
3X+4Y=166X-6Y=334(X-Y-1)=3(1-Y)-2X/2+Y/3=2
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